<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>函数参数默认值</title>
</head>
<body>
    <script>
        //ES6 允许给函数参数赋值初始值
        //1. 形参初始值  具有默认值的参数, 一般位置要靠后(潜规则)
        function add(a, b, c = 10) {
            return a + b + c;
        }

        let result = add(1, 2);
        console.log(result);

        //2.与解构赋值结合
        function connect({host = "127.0.0.1", username, password, port}) {
            console.log(host);
            console.log(username);
            console.log(password);
            console.log(port);

        }

        connect({
            host: 'localhost',
            username: 'root',
            password: 'root',
            port: 3306
        })
    </script>
</body>
</html>